Exporting data as CSV - error

Hello,
Using TBB meter in Windows 7 Professional 64-bit.
In MENU/FULL STATS/EXPORT get an error message along the lines of "Can't find location with a path that includes sys32/config".
Any ideas please as I am trying to keep a running total of BB usage between two PCs. Dare I say that the other one runs vnstat in Ubuntu and works fine, but I would like to get TBB working as well. Everything else working OK in Win 7.
Thanks

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Re: Exporting data as CSV - error

Hello,
Thanks for replying. I didn't choose it in the first place. When you hit EXPORT, up pops a window with sys32 etc. already filled in. I wouldn't normally touch it with a bargepole. I looked through OPTIONS etc, but nowhere to choose destination. This is all the result of having no confidence in the BT usage monitor which is always out of date and regularly returns different usage figures for the same day. BT are quick to fine you £5 per month for a byte over 40GB, but don't provide a reliable means of keeping a check.
Regards